ubuntu升级composer到最新版本(2.0-dev)

在Laravel部署过程中，发现Composer版本过低，准备对其升级：

composer self-update

结果提示：

  [InvalidArgumentException]             
  Command "self-update" is not defined.

一、卸载重新安装composer

没有升级名利，所以我准备卸载重装，但是发现并不是最新版本，应该是源没有更新：

# 卸载composer
apt-get remove composer
# 安装composer
apt-get install composer

结果安装的还是1.0.0~beta2-1版本：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
composer is already the newest version (1.0.0~beta2-1).
0 upgraded, 0 newly installed, 0 to remove and 334 not upgraded.

二、安装最新版本的composer

# 下载composer.phar
wget https://getcomposer.org/composer.phar
# 重命名composer.phar为composer
mv composer.phar composer
# 增加可执行权限
chmod +x composer

进入其他目录执行composer找到目录，并且将composer移动过去：

sudo mv composer /usr/bin/composer

然后执行composer即可知道是否安装成功

composer

命令参考ubnutu/apt命令大全